The first step in oogenesis is when a
A. secondary oocyte divides to form a polar body and an egg cell.
B. primary oocyte divides to form a secondary oocyte and a first polar body.
C. corpus luteum becomes a corpus albicans.
D. follicle becomes a corpus luteum.
Answer: B
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The ________ secretes several hormones that stimulate the development of lymphatic organs and regulates development and activity of T cells (white blood cells).
A. spleen B. thymus C. thyroid D. adrenal gland E. parathyroid
The rungs of the DNA ladder are composed of
A. glucose-phosphate chain. B. sugar-phosphate chain. C. adenine-ribose chain. D. nitrogen base pairs.
The ________ nervous system signals blood vessels to constrict
A) Parasympathetic B) Sympathetic C) Central D) Peripheral
Which hypothalamic nucleus is responsible for regulating circadian rhythms?
A) suprachiasmatic nucleus B) preoptic area C) autonomic nucleus D) paraventricular nucleus E) tuber cinereum